Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais são as notas dos Estados Unidos?
 ###Tabelas: CREATE TABLE personnel_and_sponsorship (personnel_and_sponsorship_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Chairman VARCHAR, Head Coach VARCHAR, Captain VARCHAR, Kitmaker VARCHAR, Shirt sponsor VARCHAR) CREATE TABLE semifinal_a_b_2 (semifinal_a_b_2_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rowers VARCHAR, Country VARCHAR, Time VARCHAR, Notes VARCHAR) CREATE TABLE analytical_table (analytical_table_id AUTO_INCREMENT PRIMARY KEY, State VARCHAR, Votes INT, Votes since 1856 INT, Democratic votes INT, D votes since 1856 INT, % of D votes VARCHAR, D % since 1856 VARCHAR, Republican votes INT, % of R votes VARCHAR, R % since 1856 VARCHAR, Other votes INT, O votes since 1856 INT, % of O votes VARCHAR, O % since 1856 VARCHAR) CREATE TABLE first_conversion_period_1867–1887 (first_conversion_period_1867–1887_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Railway number(s) VARCHAR, Quantity rebuilt INT, Rebuild year(s) VARCHAR, Type VARCHAR) CREATE TABLE michigan_counties_by_per_capita_income (michigan_counties_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT)  
SELECT Notes FROM semifinal_a_b_2 WHERE Country = united states